This paper describes the FEM modeling of the automatic machine that consists of linear-motion guides, ball screws, bearings and structural parts. Because the linear guide consists of balls and rails, this FEM model will be very complicated. The machine uses many linear guides, so the simulation will be too cost. The solution of this problem is to device simple FEM model of linear guides, ball screws and etc. We have designed the simple FEM model of the linear guides and ball screws. By using these models the dynamic simulation of whole machines will be possible.